Finding what the CG is on a built model?
08-25-2005, 12:41 AM
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Finding what the CG is on a built model?
hey guys i was thinking tonight and came up with this
if you used 2 digital scales each at a different point along the planes spine.
wouldn't the cg be the differential between the two?
say one read 5 pounds and one read 4 pounds wouldn't the cg be the proportion of the two shifted from the center between them?
or at 20% of the distance towards the heavier reading from the center of the two points?
see the picture for what i mean
the thought from this came from weighing a car at all 4 wheels at once to determine weight balance.
the thought being that the points the scales were at wouldn't matter as much as their spacing apart and you could find the real cg very accurately
if you used 2 digital scales each at a different point along the planes spine.
wouldn't the cg be the differential between the two?
say one read 5 pounds and one read 4 pounds wouldn't the cg be the proportion of the two shifted from the center between them?
or at 20% of the distance towards the heavier reading from the center of the two points?
see the picture for what i mean
the thought from this came from weighing a car at all 4 wheels at once to determine weight balance.
the thought being that the points the scales were at wouldn't matter as much as their spacing apart and you could find the real cg very accurately
08-25-2005, 10:48 AM
#3
RE: Finding what the CG is on a built model?
I use this method all the time myself. I have a scale and two blocks that are the same height as the scale. I place the scale under one wheel, and the blocks under the other two. Repeat three times, and it gives me lateral balance too. I think they use this method on full size.
08-25-2005, 06:47 PM
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RE: Finding what the CG is on a built model?
ORIGINAL: Ebola0001
if you used 2 digital scales each at a different point along the planes spine.
wouldn't the cg be the differential between the two?
if you used 2 digital scales each at a different point along the planes spine.
wouldn't the cg be the differential between the two?
[link=http://home.mindspring.com/~the-plumber/Vanessa.htm]"Vanessa" [/link]is considerably less expensive than a pair of digital scales and very much faster than calculating percentages. The plumb bob points to the actual CG.
Where it's _supposed to be_ is something else.
